Probably beating a dead horse, but likely if you have more than 5,000 miles on the tires when the cupping starts, it is going to be marginal that you will get any dealer to spring for brand new tire, without pro-rating and by the time you add everything up, it will be about $100 or so credit...I would expect IF you are lucky enough to find a dealer who would back you up...that is why you try to "nurture" that relationship, no matter how tough it is...